package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.PasswordConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.dto.PasswordEditDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.result.PageResult;
import com.sky.service.EmployeeService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     * @param employeeLoginDTO
     * @return
     */
    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对
        // 进行前端传入的密码进行md5加密，然后再进行比对
        password =  DigestUtils.md5DigestAsHex(password.getBytes());
        if (!password.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }


    /**
     * 新增员工
     * @param employeeDTO
     * @return
     */
    public void addEmployee(EmployeeDTO employeeDTO) {
        // 将DTO转化为实体类，这样方便将来传给前端

        Employee employee = new Employee();
        // 通过使用对象属性拷贝
        BeanUtils.copyProperties(employeeDTO, employee);

        // 设置一些参数的默认值
        // 状态默认为1，表示正常
        employee.setStatus(StatusConstant.ENABLE);

        // 对密码进行md5加密
        employee.setPassword(DigestUtils.md5DigestAsHex(PasswordConstant.DEFAULT_PASSWORD.getBytes()));

        // 设置创建时间和更新时间为当前时间
        // employee.setCreateTime(LocalDateTime.now());
        // employee.setUpdateTime(LocalDateTime.now());
        // 设置当前记录人id和修改人id
        // 使用Thread获取线程存储的id
        // employee.setCreateUser(BaseContext.getCurrentId());
        // employee.setUpdateUser(BaseContext.getCurrentId());
        employeeMapper.addEmployee(employee);
    }

    /**
     * 分页查询
     * @param employeePageQueryDTO
     * @return
     */
    public PageResult pageQuery(EmployeePageQueryDTO employeePageQueryDTO) {
        // 分页的话使用插件：PageHelper,它会动态将sql语句进行修改，添加limit语句
        // 开始分页查询
        PageHelper.startPage(employeePageQueryDTO.getPage(), employeePageQueryDTO.getPageSize());
        // 调用mapper层的方法
        Page<Employee> page = employeeMapper.pageQuery(employeePageQueryDTO);
        // 获取总条数
        long total = page.getTotal();
        // 获取当前页数据
        List<Employee> records = page.getResult();
        // 封装到PageResult中
        return new PageResult(total, records);
    }

    /**
     * 启用禁用员工账号
     * @param status
     * @param id
     */
    @Override
    public void status(Integer status, Long id) {
        // 根据id查询员工
        Employee employee = employeeMapper.getById(id);
        // 判断当前员工是否存在
        if (employee == null) {
            // 不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        } else {
            // 存在，修改状态
            employee.setStatus(status);
            // employee.setUpdateTime(LocalDateTime.now());
            // employee.setUpdateUser(BaseContext.getCurrentId());
            employeeMapper.update(employee);
        }
    }

    @Override
    public Employee getById(Long id) {
        Employee employee = employeeMapper.getById(id);
        // 判断当前员工是否存在
        if (employee == null) {
            // 不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        } else {
            return employee;
        }
    }

    /**
     * 修改员工信息
     * @param employeeDTO
     */
    @Override
    public void update(EmployeeDTO employeeDTO) {
        // 根据id查询员工
        Employee employee = employeeMapper.getById(employeeDTO.getId());
        // 判断当前员工是否存在
        if (employee == null) {
            // 不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        } else {
            // 将DTO转化为实体类，这样方便将来传给前端
            BeanUtils.copyProperties(employeeDTO, employee);
            // employee.setUpdateTime(LocalDateTime.now());
            // employee.setUpdateUser(BaseContext.getCurrentId());
            employeeMapper.update(employee);
        }
    }

    /**
     * 修改密码
     * @param passwordEditDTO
     */
    @Override
    public void updatePwd(PasswordEditDTO passwordEditDTO) {
        // 前端没有传id，那就只能从jwt中去获取当前用户信息的id：BaseContext.getCurrentId()
        Employee employee = employeeMapper.getById(BaseContext.getCurrentId());
        // 判断当前员工是否存在
        if (employee == null) {
            // 不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        } else {
            // 比对原密码是否正确：对前端传入的密码进行md5加密，然后再进行比对
            String oldPwd = passwordEditDTO.getOldPassword();
            oldPwd = DigestUtils.md5DigestAsHex(oldPwd.getBytes());
            if(oldPwd.equals(employee.getPassword())) {
                // 修改密码
                String newPwd = passwordEditDTO.getNewPassword();
                // 更新md5加密后的密码
                employee.setPassword(DigestUtils.md5DigestAsHex(newPwd.getBytes()));
                // employee.setUpdateTime(LocalDateTime.now());
                // employee.setUpdateUser(BaseContext.getCurrentId());
                employeeMapper.update(employee);
            } else {
                throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
            }
        }

    }
}
